7 6 Mr.  hutton  on  the  initial 
The  fourth  courfe  was  on  the  20th  of  July,  a fine 
clear  day.  The  powder  was  a mixture  of  feveral  of  the 
forts  made  for  government,  and  the  balls  were  of  lead. 
The  quantities  of  powder  were  two,  four,  and  eight 
ounces  alternately;  and  the  dimenfions  at  firftwere  thus: 
p — 5 5 2 pounds,  the  whole  weight  of  the  pendulum. 
r — 1 01  inches,  its  whole  length. 
g — 78  inches,  the  diliance  of  the  center  of  gravity. 
h — 88  inches  = 7^  feet,  that  of  the  center  of  ofcil- 
lation. 
• 
<D 
e 
p 
\r~w 
Weight  of 
powder. 
Diam.  of 
the  ball. 
Height  of 
the 
charge. 
Struck  be- 
low the 
axis,  k. 
Weight  of 
the  ball. 
Weight  of 
the  bal  1,£. 
Values 
of  />, 
Values 
of  g. 
Chord 
of  the 
arc  c. 
V eloc.  per 
fecond. 
£ 
Oz. 
Inches. 
Inches. 
Inches. 
Oz. 
Pounds 
Pounds 
Inches. 
Inches. 
Feet 
I 
2 
2.021 
2.85 
90. 
281 
1.766 
55.2-° 
78.0 
14.8 
612 
2 
4 
2.021 
44 
87. 
1.766 
Or 
Cn 
Oo 
bo 
78.0 
20.5 
879 
3 
8 
2.032 
87. 
.281 
1 • 7 9 7 
555-5 
78.1 
27.5 
1164 
4 
2 
2.026 
2.85 
90. 
1.781 
557-3 
78. 1 
15.0 
622 
5 
4 
2.026 
4.4 
88. 
28| 
r. 781 
559- 1 
78.1 
20.5 
871 
6 
8 
2.032 
7-i 
92. 
28| 
1 - 7 9 7 
560.9 
78.2 
28.5 
11 54 
7 
2 
2.021 
2.85 
89.8 
281 
1.766 
5.62.7 
78.2 
14-3 
605 
8 
4 
2.026 
44 
9i-3 
281 
1.781 
564-5 
78.2 
21.0 
870 
9 
8 
2.026 
7-i 
87. 
28| 
1.781 
566.2 
78-3 
26.8 
1 169 
Let  us  now  collect  together  the  feveral  velocities  be- 
longing to  the  fame  quantity  of  powder,  in  order  to  take 
their  means,  thus : 
Veloc. 
